Thread-controller for sewing-machines.



L. ONDERDONK.

THREAD CONTROLLER FOR SEWING MAGHINES.

APPLIOATION FILED SEPT. 10, 1907. 1,1 Patented D60. 8, 1914.

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L. ONDERDONK.

NTROLLEE FOR SEWING MACHINES.

FILED SE 1907. 1 1 20,524. Patented Dec. 8, 1914;

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LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

THREAD-CONTROLLER FOR SEWING-MACHINES.

Application filed September 10, 1907.

To all wlwm it may concern Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Thread- Gontrollers for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the letters and figures of reference marked thereon.

My invention relates to new and useful improvements in thread controllers for sewing machines, and has for its object to provide a thread controller which will be positive in its movements and which is especially adapted for operation in connection with a plurality of threads.

My invention consists in the parts arrangements and improvements hereinafter shown and described and set forth in the claims.

In the drawings which show by way of illustration one embodiment of my invention: Figure 1 is a top plan View showing my thread controller as applied to looper threads of a sewing machine. Fig. 2 is a sectional view showing the thread controlling member in side elevation. Fig. 3 is a sectional view showing the thread clamp and rotary pull off in side elevation. Fig. 4: is a sectional view of the bed plate, showing the thread guide carried thereby. Fig. 5 shows a modified form of thread arm. Fig. 6 is a detail showing the needle and looper with the looper thread held taut.

In the present illustration of my invention, I have shown the thread controller as applied to the looper threads of sewing machines.

The sewing machine as illustrated in the drawings, comprises a bed plate 1 from which rises a work supporting post 2, having mounted therein a plurality of loopers 3, which are oscillated by suitable mechanism, not shown, and which cooperate with suitable needles to form stitches.

The thread controlling mechanism herein shown is especially adapted for use in connection with a machine of the type illustrated in my co-pending application, Serial Number 392,204, filed of even date herewith.

A rotary shaft 4 is carried by bearings formed in the bed plate. Said bed plate is provided with an opening 5, which is closed Specification of Letters Patent.

Patented Dec. 8, 1914.

Serial No. 392,206.

on the bed plate 1, by a screw 23. The thread guiding wire 9 is formed at its for ward end with thread eyes 24;, 25. The

bracket 21 has a forwardly extending arm 26 in which is mounted a screw 27. Said screw is so located that the thread controlling wire normally rests thereon. A spring 28 is secured to the bracket 21 by a screw 29 and said spring bears against an upturned portion 30 of the thread wire, and serves to hold said thread wire in contact with the screw 27. WVhen the screw 27 is adjusted, the position of the thread eyes 24, 25 will be raised or lowered depending u on the direction in which the said screw 2 is turned. The thread guiding wire 9 may be readily turned about its pivot 20 to an upright position for threading and the spring 28 will serve to hold said thread wire in said threading position.

Mounted on the main shaft 4: is an eccentric 31. An eccentric strap 32 surrounds said eccentric 31 and is pivoted at 33 to a link 34 which in turn is pivoted at 35 to the bracket 21. Said eccentric strap is provided with a projecting car 36 in which is mounted a thread arm 37 having its outer end hook-shaped as shown at 38, (see Fig. 2 of the drawing). Said thread arm 37 is threaded and is secured to the lug 36 by suitable nuts 39 and 40. It will be obvious that by adjusting the nuts 39 and 40, the position of the thread arm 37 may be adjusted relative to the eccentric strap 32. The eccentric 31, the eccentric strap 32, and thread arm 37, are so disposed upon the main shaft 4: that the thread arm vibrates between the thread guides 24 and 25 as shown in Fig. 1.

In order that the thread may be clamped at certain times between the thread arm 37 and the supply, I have provided a thread clamp which consists of a spring arm 41, (see Fig. 3), which is secured to the bracket 21. Said spring arm 41 carries an off set portion 42 which rests upon an eccentric 43 mounted. upon the main shaft 4.. Cooperati able screw 51.

ing with the spring arm 41, is a clamping arm 44 which together with the arm 41 is secured to the bracket 21 by a suitable screw 45. The spring arm 41 is provided With an upwardly projecting finger 46, which serves as a stop to hold the thread properly positioned'betweenthe outer ends of the clamping arms 41 and 44. It will be obvious that as the eccentric 43 is rotated with the main shaft, the spring arm 41 will be lifted and brought into contact with the clamping arm 44'or the thread passing between the same.

v In order to provide means for pulling thread from the supply, so that the lcopers may be relieved from the usual strain thereon in pulling the thread from the supply, I have mounted a pull off 47 on the main shaft 4 between the thread clamp and the -supply. Said pull ofi' cam 47 is preferably of the configuration shown in Fig. 3 and as the main shaft rotates said pull ofl cam will be brought into contact with the thread between the thread clamp and the supply and pull ofi a certain amount of thread from said supply. It will be noted from Fig. 3 that the disposition of the pull ofi cam relative to the eccentric 43 is such that the clamping arms 41 and 44 are brought together to clamp the thread prior to the enlarged portion on the pull ofi cam, contacting with the thread to pull thread from the sup 'ly. order that the amount of thread pulled from the supply maybe varied, I have provided the adjustable thread controlling arm or guide 48. Said arm 48 is pivoted at 49 to the bracket 21. The bracket2l is provided with a pro ecting lug 50 in which is mounted an adjustable screw 51 V, The arm 48 is provided with a shoulder which normally rests upon the adjust- At its outer end, the arm '48 is provided with a thread guiding groove 53. The thread is led from the supply through an opening 54 in the bed plate, thencethrough the thread guiding groove 5:3, in the controlling arm 48, and then across the face of the pull off cam and between the I clamping arms 41 and 44. From the thread clamp, the thread is led through the thread e'ye24 to the thread controlling. arm 37 and then to the thread eye 25. The thread after leaving the thread controlling mechanism i 'pfassesthrough an opening in the bed plate 55 and along the upper surface of bed plate 1 underneath a protecting strip 56 to the work supporting post. The protecting strip 5 6 issecured to the bed plate by suitable screws 57 and is formed with an overhang- 58 (see Fig. 4), underneath which 'thl thread passes. The thread is then led f upt'he side 'ofthe work supporting post unj aeraean or thread guide 59 and at the 1 upper end said thread passes underneath a guiding finger 60 and then to the loopers. The operation of my device will be obvious from the above description. As the main shaft rotates, the thread arm37 will be brought into engagement with the thread passing between the thread guides 24 and 25 and .a certain pull exerted upon the looper thread. The thread clamp is closed at a cer tain time and while said thread clamp is closed, the pull off cam operates to pull thread from the supply.

My improved thread controlling device is especially adapted for use in connection with a plurality of threads for the reason that a rotary controller operating upon a plurality of threads is likely to intertwist the threads, thus causing abreaking of one or more of said threads;

The thread arm is so timed relative to the movements of the looper that the looper thread is engaged by said arm and the slack in the looper thread taken up as the looper is moved backward. It is essential that the looper thread shall'be practically taut from the looper eye to the previous stitch as the needle passes into the looper thread loop, as shown in Fi'g 6 wherein the needle 71 is shown as passing between the looper thread T and the body of p the looper L. My thread arm engages the looper thread at the proper time to securethis result.

In Fig. 5, I have shown a modified form" of thread arm 37 which has an upwardly extending member 37 which is bent back upon itself and has its end 37 located close to the eccentric strap 32. The thread arm is adjustably held in place by a screw 37 In this form of my device, the upward projecting arm 37 contacts with the thread between the thread guides 24 and 25 and operates to take up the slack in the looper thread, as the looper begins its backward movement and the looper thread is substantially taut between the looper eye and the previous stitch at the time the point of the needle is entering the so called looper thread loop. As soon as however, the point of the needle has entered the looper thread loop, the looper thread slips'off from the arm 3,7 The only difference in ,this form of my invention and that shown in the other figures,

is that the arm shown in Fig. 5' drops the thread which is retained by the hook shaped arm in the other figures, and graduallygiven up to the looper by the hook in its further movements. 1

It will be obvious that minor changes in the details of construction setforth may be made without departing from the spirit of my invention I Having thus particularly described my invention, what I claim "as new and desire to secure by Letters Patent is I 1. A sewing machine including in combination a rotating shaft, an eccentric carried thereby, a strap cooperating with said izo nected to said strap and movable therewith, a link pivoted to a stationary part of the machine frame and to said strap, and thread guides on each side of said take-up memher.

2. A sewing machine including in combination a rotating shaft, an eccentric carried thereby, an eccentric strap, a thread arm rigidly carried by said eccentric strap and movable therewith, a link pivoted at one end to said eccentric strap at a point on the opposite side of the rotating shaft from said thread arm, the other end of said link being pivoted to a stationary part of the machine frame, and thread guides cooperating with said thread arm.

3. A sewing machine including in combination a rotating shaft, an eccentric carried thereby, an eccentric strap, a thread arm rigidly carried by said eccentric strap and movable therewith, a link pivoted at one end to said eccentric strap at a point on the opposite side of the rotating shaft from said thread arm, the other end of said link being pivoted to a stationary part of the machine frame, and thread guides cooperating with said thread arm, said link being disposed below said rotating shaft, and said take-up arm being disposed above said shaft and extending in a direction substantially tangential to the eccentric.

4:. A sewing machine including in com bination a rotating shaft, an eccentric carried thereby, an eccentric strap, a thread arm rigidly carried by said eccentric strap and movable therewith, a link pivoted at one end to said eccentric strap at a point on the opposite side of the rotating shaft.

from said thread arm, the other end of said a link being pivoted to a stationary part of the machine frame, and thread guides cooperating with said thread arm, said link being disposed below said rotating shaft, and said take-up arm being disposed above said shaft and extending in a direction substantially tangential to the eccentric, said take-up arm having the end thereof hookshaped and so disposed relative to the thread guides as to operate substantially at one side of a line passing through said thread guides.

5. A sewing machine including in combination a rotating shaft, an eccentric carried thereby, an eccentric strap, a take-up member rigidly carried by said eccentric strap and movable therewith, a link pivoted at one end to said eccentric strap at a point on the opposite side of the rotating shaft from said take-up member, the other end of said link being pivoted to a stationary part of the machine frame, and thread guides cooperating with said take-11p member, said take-up member being in the form of an arm extending substantially tangential to the eccentric and adjustably con nected therewith, said arm having its outer end bent so as to engage the thread extending between the thread guides.

In testimony whereof I affix my signature, in presence of two witnesses.

LANSING ONDERDONK.

Witnesses:

WALTER HARTLEY, FRANKLIN H. CHILTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

